SOLVED

51) What is the concentration of Ag+ if 0.125 g of AgC2H3O2 is placed in 100.0 mL of 1.00 M NH3? Kf = 1.6 × 107 for [Ag(NH3)2]+ A) 4.8 × 10-10 M B) 5.6 × 10-10 M C) 8.0 × 10-8 M D) 8.3 × 10-6 M E) 7.5 × 10-3 M 52) What is the concentration of Zn2+ if 0.254 g of ZnCl2 is dissolved in 200.0 mL of 2.00 M NH3? Kf ([Zn(NH3)4]2+) = 4.1 × 108 A) 0.0093 M B) 1.5 × 10-12 M C) 2.4 × 10-9 M D) 2.3 × 10-12 M E) 0.0019 M 53) What is the concentration of Cu2+ if 0.235 g of CuCl2 is dissolved in 300.0 mL of 0.550 M NH3? Kf ([Cu(NH3)4]2+) = 1.1 × 1013 A) 5.8 × 10-15 M B) 1.0 × 10-15 M C) 6.9 × 10-15 M D) 5.8 × 10-3 M E) 1.2 × 10-12 M 54) What is the concentration of Ni2+ if 0.223 g of NiCl2 is dissolved in 250.0 mL of 0.760 M NH3? Kf ([Ni(NH3)6]2+) = 5.5 × 108 A) 6.9 × 10-3 M B) 7.6 × 10-11 M C) 1.3 × 10-11 M D) 9.7 × 10-11 M E) 1.4 × 10-11 M 55) What is the approximate concentration of free Fe2+ remaining at equilibrium in a solution prepared by mixing 5.0 mL of 0.10 M FeSO4 with 5.0 mL of 2.0 M KCN? [The net formation constant for the hexacyanoferrate(II) ion is 1 × 1037.] A) 3 × 10-22 M B) 7 × 10-30 M C) 4 × 10-38 M D) 5 × 10-37 M E) 4 × 10-40 M 56) In the compound K4[Fe(CN)6], the oxidation state of iron and its coordination number, respectively, are ________. A) -4 and ten B) 0 and ten C) +4 and four D) +2 and six E) -4 and six 57) In the cation [CrCl2(H2O)4]+, the oxidation state of chromium and its coordination number, respectively, are ________. A) -3 and two B) +3 and six C) 0 and four D) +2 and six E) -4 and six 58) In the cation [CoCl2(en)2]+, the oxidation state of cobalt and its coordination number, respectively, are ________. A) -3 and two B) +2 and six C) +4 and four D) +3 and six E) -4 and six 59) If a central ion has a coordination number of 4 we might expect the geometry of the complex ion to be ________. A) octahedral B) cubical C) trigonal bipyramidal D) square planar E) trigonal planar 60) A compound has the empirical formula CoCl3 ? 5NH3. One mole of it yields two moles of silver chloride when treated with silver nitrate. Ammonia is not removed by treatment with concentrated sulfuric acid. A reasonable formula for the compound is ________. A) [Co(NH3)5]Cl3 B) CoCl3 ? 5NH3 C) [Co(NH3)4Cl]Cl2 ? NH3 D) [Co(NH3)5Cl]Cl2 E) [Co(NH3)4Cl2]Cl ? NH3